The smaller 4 letter word could be "Tiny".
a Bump?
lyre
dent
tart
gnat
teal
bead
The 4-letter word that means a small amount of something is "mite." A mite is a very small amount or portion of something, often used to indicate a tiny quantity. It can also refer to a tiny arachnid belonging to the Acari order.
One option is baby.
the answer is "TOE HOLD"
Worn!! your welcome...
very